The read() method of the ReadableStreamBYOBReader interface is used to read data into a view on a user-supplied buffer from an associated readable byte stream. A request for data will be satisfied from the stream's internal queues if there is any data present. If the stream queues are empty, the request may be supplied as a zero-copy transfer from the underlying byte source.
Optionaloptions: ReadableStreamBYOBReaderReadOptionsThe releaseLock() method of the ReadableStreamBYOBReader interface releases the reader's lock on the stream. After the lock is released, the reader is no longer active.
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ReadableStreamBYOBReaderinterface of the Streams API defines a reader for a ReadableStream that supports zero-copy reading from an underlying byte source. It is used for efficient copying from underlying sources where the data is delivered as an "anonymous" sequence of bytes, such as files.MDN Reference